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IAUC 7137: 1999bg; C/1998 M5

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                                                  Circular No. 7137
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1999bg IN IC 758
     K. Ayani, Bisei Astronomical Observatory (BAO); and H. Yamaoka,
Kyushu University, report:  "We have obtained a CCD spectrum (range
400-750 nm) of SN 1999bg (cf. IAUC 7135) on Mar. 31.6 UT with the
1.01-m BAO telescope.  Preliminary reduction reveals that, although
affected by moonlight, the spectrum shows an almost-featureless
continuum with a weak, broad absorption feature at about 470 nm.
There probably exists a weak P Cyg-like feature in the range
625-680 nm.  If these belong to H-beta and H-alpha, so that the
supernova is of type II, the expansion velocity would be about
11 000 km/s.  The narrow H-alpha emission, likely due to the
surrounding H II region at the position on a Digitized Sky Survey
image, shows that the recession velocity of IC 758 is about 1100
km/s."


COMET C/1998 M5 (LINEAR)
     Ephemeris extension to IAUC 7115 (orbital elements MPC 34126):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr.  2     8 04.4    +72 05.7   1.642   1.947   91.6   30.9   10.0
      7     8 09.39   +67 20.9   1.698   1.976   90.3   30.4   10.1
     12     8 14.28   +62 51.2   1.763   2.006   88.6   30.0   10.3
     17     8 19.11   +58 37.9   1.836   2.038   86.5   29.4   10.4
     22     8 23.92   +54 41.6   1.918   2.071   84.1   28.9   10.6
     27     8 28.72   +51 02.2   2.005   2.105   81.4   28.2   10.7
May   2     8 33.50   +47 39.0   2.098   2.140   78.6   27.5   10.9
      7     8 38.26   +44 30.9   2.195   2.176   75.6   26.7   11.1
     12     8 43.02   +41 36.8   2.296   2.214   72.6   25.8   11.3
     17     8 47.78   +38 55.3   2.399   2.252   69.4   24.9   11.4
     22     8 52.52   +36 25.3   2.503   2.290   66.2   23.8   11.6
     27     8 57.26   +34 05.6   2.609   2.330   62.9   22.8   11.8
June  1     9 01.97   +31 55.1   2.715   2.370   59.7   21.7   11.9
      6     9 06.66   +29 52.7   2.820   2.411   56.4   20.5   12.1
     11     9 11.33   +27 57.6   2.925   2.453   53.0   19.3   12.2
     16     9 15.98   +26 08.8   3.028   2.494   49.7   18.1   12.4
     21     9 20.61   +24 25.7   3.129   2.537   46.3   16.8   12.5

     Total visual magnitude estimates:  Mar. 12.83 UT, 8.7 (K.
Hornoch, Lelekovice, Czech Republic, 10x80 binoculars); 17.03, 9.1
(J. E. Bortle, Stormville, NY, 20x80 binoculars); 22.80, 8.9 (M.
Reszelski, Szamotuly, Poland, 20x60 binoculars); 27.12, 8.8
(Hornoch).

                      (C) Copyright 1999 CBAT
1999 April 2                   (7137)            Daniel W. E. Green

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